Dysnomia is visible above just to the right of Eris.

在图中戴丝诺米娅位于厄里斯的右方。

The mass was calculated by timing the orbit of Eris' moon Dysnomia.

过对厄里斯的卫星--戴丝诺米娅运行时后算出了厄里斯的质量。